Million is a number, proper nouns are people, places, months, day of the week, etc. Therefor, million is a common noun.
"Park Avenue" is a proper noun, because it is a place. Proper nouns like this should always be capitalized.
It is a proper noun, because it is the name of a specific thing.
proper
Proper noun
The noun 'million' is a common noun, a general word for a large number; a general word for a thing.A proper noun is the name of a specific person, place, or thing; for example, the 2004 movie "Million Dollar Baby" or the Million Dollar Highway (US Route 550) in New Mexico and Colorado.
Pencil proper or common noun
it's a common noun. a proper noun would be Spider-Man.
Proper noun or common noun
The noun cassette is a common noun.
a common noun?
Camel is a common noun.
The answer is proper noun. Examples of common noun and proper noun are: Proper noun: Mary Collins Common noun: monkey